I am using a AMD Ryzen 7 3700X CPU with Wraith Prism cooler on MSI MPG X570 motherboard. Fan configuration is PWM. Hardware monitor in BIOS shows CPU fan speed of 270 rpm (sometimes 0 rpm). BIOS test with 'full speed' of fan hardly increases this speed (290 rpm). When I start Windows, after 10-15 min I get a warning about the CPU temperature. Does anyone have an idea what could go wrong: is it some BIOS setting which is not ok, or is it a hardware problem (fan or motherboard)? Thanks for any advice!